Question

why friction is necessary evil discuss?
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Answer 1

Answer:

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .

Answer 2

$\huge \sf {Question :-}$

why friction is necessary evil discuss?

$\huge \sf{Answer :-}$

$\tt\green{\underline{\underline{\underline{friction \: is \: necessary \: evil \: because}}}}$

$\Rightarrow$ Friction produces unnecessary heat leading to the wastage of energy.

$\Rightarrow$The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.

$\Rightarrow$Forest fires are caused due to the friction between tree branches.

$\Rightarrow$A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.